In 3 easy steps, you can have your store selling downloadable products instantly.
What is PayPal IPN?
When your PayPal account receives a payment, PayPal will notify you by calling a URL to your server. That method is called IPN, Instant Payment Notification. Your server can be called upon to send an email with the download link to the customer.
Why do I need IPN to sell downloads?
IPN is designed to be secure, reliable, and asynchronous. When you enable IPN, PayPal sends messages to the IPN URL you specify in your account profile. Even if the payment is pending, the IPN will still work. The best way to sell downloads is to use PayPal IPN and PDT together.
Other topics:
Setup link expiration requirements
Customize the "from" and "cc" on emails